Ultrasound und railway semaphore: was sie gemeinsam haben
- Schritt 1. Ultrasound — wird verwendet in — Kataraktoperation. Phacoemulsification.
- Schritt 2. Kataraktoperation — nutzt — Lens. An artificial lens is a lens.
- Schritt 3. Lens — wird verwendet in — Optical telegraph. Signals were read through telescopes.
- Schritt 4. Optical telegraph — entwickelte sich zu — Railway semaphore. The semaphore idea.